ADSORPTION OF CHROMIUM-(VI) BY A LOW-COST ADSORBENT - BIOGAS RESIDUALSLURRY

Ability of waste biogas residual slurry (BRS) to remove Cr (VI) from a queous solutions was investigated. The influence of various parameters such as metal ion concentration, contact time, adsorbent dosage, adso rbent particle size, temperature and pH on the removal of Cr (VI) has been studied. The adsorption followed first order rate expression. The equilibrium data fit well into Langmuir and Freundlich isotherms. Ads orption was maximum at an initial pH of 1.51. Temperature studies show ed that the adsorption process was endothermic in nature.